JP2005155329A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor preventing overturn even at a low compression ratio and having high reliability, in the asymmetry lap shaped scroll compressor capable of realizing high efficiency. <P>SOLUTION: An inner wall of a spiral lap 12b of a fixed scroll 12 is formed by an inner wall curve of the spiral lap 12b of the fixed scroll 12 extending near to a winding-end edge of an outer wall curve of a spiral lap 13b of a turning scroll 13. Therefore, the fixed scroll 12 has a so-called asymmetry lap shape. A sliding partition ring 78 is placed on a main bearing member 11 by deviating from a center point Ob of the main bearing member 11, such that an action center point of force in a thrust direction from a compression chamber 15 applied to the turning scroll 13 is approximately equal to a center point Oa of the sliding partition ring 78. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor used in an air conditioner, a cooling device such as a refrigerator, or a hot water supply device.

Conventionally, this type of scroll compressor has formed the inner wall of the fixed scroll spiral wrap by, for example, the inner wall curve of the fixed scroll spiral wrap extending to the vicinity of the end of the outer wall curve of the spiral scroll spiral wrap. Is asymmetric (see, for example, Patent Document 1), or provided with a sliding partition ring concentric with the base circle of the orbiting scroll, and the sliding partition ring is installed on the back of the end plate of the orbiting scroll (for example, Patent Document 1) 2).
JP 2000-97176 A Japanese Patent Laid-Open No. 7-229486

  In the conventional technique as described in Patent Document 1, the spiral volume of the fixed scroll is asymmetrically wrapped so that the spiral scroll of the orbiting scroll is extended to near the end of the spiral wrap. The wrap height or outer shape can be reduced. In addition, since the compression chamber in which the outer wall of the spiral wrap of the orbiting scroll is formed on the side can minimize heat loss and pressure loss in the suction process of confining the working fluid, the scroll compressor can be made compact, Loss in the working fluid suction process can be reduced.

  However, the working fluid in the compression chamber formed on the outer wall side of the wrap portion of the orbiting scroll and the working fluid in the compression chamber formed on the inner wall side of the wrap portion of the orbiting scroll are compressed with a pressure difference. become. This pressure difference between the compression chambers increases the rollover moment acting on the orbiting scroll. As a result, it will capsize under operating conditions with a low compression ratio, causing an extreme decrease in refrigerant circulation. If the pressing force acting on the back of the orbiting scroll is increased in order to suppress rollover at a low compression ratio, an excessive pressing force is generated on the orbiting scroll under high compression ratio operating conditions, causing galling and abnormal wear. Had.

  Further, in the configuration as described in Patent Document 2, the symmetric splash is effective, but in the asymmetric splash, the working fluid in the compression chamber formed on the outer wall side of the wrap portion of the orbiting scroll, and the orbiting scroll. Since the working fluid in the compression chamber formed on the inner wall side of the lap part has a pressure difference, the overturning moment that acts on the orbiting scroll increases, and as a result, it overturns under operating conditions with a low compression ratio, It had the problem of causing an extreme decrease.

  In particular, when carbon dioxide is used as a refrigerant, the discharge pressure of the compressor is about 7 to 10 times higher than the high-pressure side pressure of a conventional refrigeration cycle using chlorofluorocarbon as a refrigerant. Since it is low and the heat insulation coefficient is large, the overturning moment is larger than that of the conventional chlorofluorocarbon refrigerant. For this reason, if the orbiting scroll component is applied with a back pressure sufficient to prevent it from being separated from the fixed scroll component, the orbiting scroll component is strongly pressed against the fixed scroll component, leading to abnormal wear of the scroll sliding portion and an increase in input. .

Therefore, the present invention has been made in view of the above-described conventional problems, and in an asymmetrical spring, it does not increase back pressure even at a low compression ratio, prevents rollover, and ensures high reliability without galling or abnormal wear. An object is to provide a scroll compressor.

  In order to solve the above-described conventional problems, the scroll compressor of the present invention uses carbon dioxide as a refrigerant, and the inner wall curve of the spiral scroll of the fixed scroll that extends to the vicinity of the winding end of the outer wall curve of the spiral scroll of the orbiting scroll, The center point of the sliding partition ring is located at the same position as the center point of the thrust force from the compression chamber that acts on the orbiting scroll and forms the inner wall of the spiral scroll of the fixed scroll. It is.

  This ensures high reliability in the compression chamber formed on the outer wall side of the wrap portion of the orbiting scroll, while maintaining a low compression ratio and reducing pressure loss and heat loss while reducing the pressure loss and heat receiving loss. An object of the present invention is to provide a scroll compressor.

  The scroll compressor of the present invention can ensure high efficiency and high reliability without reducing heat receiving loss and pressure loss during the suction process, and without overturning even at a low compression ratio.

  The first invention uses carbon dioxide as a refrigerant to form the inner wall of the fixed scroll spiral wrap by the inner wall curve of the fixed scroll spiral wrap extending near the end of the outer wall curve of the spiral scroll spiral wrap, and By placing the center point of the sliding partition ring on the main bearing member at a position substantially the same as the center point of the thrust force acting from the compression chamber acting on the orbiting scroll, the orbiting scroll wrap In the suction process of confining the working fluid in the compression chamber formed on the outer wall side of the section, the pressure loss and heat receiving loss can be reduced, the back pressure can be increased, and the operation can be performed without overturning even at a low compression ratio. Even if a refrigerant is used, an excessive surface pressure is not generated on the thrust surface, so that high reliability can be ensured.

  The second invention uses carbon dioxide as a refrigerant to form the inner wall of the fixed scroll spiral wrap by the inner wall curve of the fixed scroll spiral wrap extending near the end of the outer wall curve of the spiral scroll spiral wrap, and By placing the center point of the sliding partition ring on the back of the end plate of the orbiting scroll at a position almost the same as the center point of the thrust force acting from the compression chamber acting on the orbiting scroll, the orbiting scroll Since the part where the high pressure part on the back of the end plate of the orbiting scroll is applied can be kept constant even if the orbit is turned, it can be operated without overturning even at a low compression ratio without increasing the back pressure and high reliability. Can be kept.

  According to a third invention, in the second invention, a passage for supplying the lubricating oil supplied to the high pressure portion to the back pressure space is provided in the main bearing member, and provided in the main bearing member by a turning motion of the orbiting scroll component. An opening at one end of the formed passage reciprocates between the high-pressure part and the back pressure space across the seal member, thereby intermittently communicating the high-pressure part and the back pressure space. Therefore, it is possible to suppress the performance degradation due to suction heating and to achieve high efficiency.

  In the fourth invention, particularly in the main bearing members of the second and third inventions, at least the sliding surface with the sliding partition ring is made of an aluminum-based material, so that the sliding property with the sliding partition ring is good. Therefore, the sealing performance between the sliding partition ring and the main bearing member is improved, and high efficiency and high reliability can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a vertical scroll compressor according to a first embodiment of the present invention, and FIG. 2 is a front view of a main bearing member of the scroll compressor according to the first embodiment of the present invention. The object to be compressed is a carbon dioxide refrigerant.

  As shown in FIG. 1, it is fixed between a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in a sealed container 1 and a fixed scroll 12 bolted on the main bearing member 11. An Oldham that forms the scroll-type compression mechanism 2 by sandwiching the orbiting scroll 13 that meshes with the scroll 12 and guides the orbiting scroll 13 to rotate between the orbiting scroll 13 and the main bearing member 11 so as to move in a circular orbit. A rotation restricting mechanism 14 such as a ring is provided, and the orbiting scroll 13 is eccentrically driven by the main shaft portion 4 a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 13 to move in a circular orbit, thereby causing the fixed scroll 12 and the orbiting scroll 13 to move. Using the fact that the compression chamber 15 formed between the outer peripheral side becomes smaller while moving from the outer peripheral side to the central portion, Refrigerant gas is sucked from the suction pipe 16 and the suction port 17 on the outer peripheral portion of the fixed scroll 12 and compressed, and the refrigerant gas becomes a predetermined pressure or more from the discharge port 18 at the center of the fixed scroll 12 to the reed valve 19. Is repeatedly opened and discharged into the sealed container 1.

  The fixed scroll 12 forms the inner wall of the spiral wrap 12b of the fixed scroll 12 by the inner wall curve of the spiral wrap 12b of the fixed scroll 12 extending to the vicinity of the winding end of the outer wall curve of the spiral wrap 13b of the orbiting scroll 13. It has a so-called asymmetric wrap shape.

  A sliding partition ring 78 disposed on the main bearing member 11 is provided on the back surface portion of the orbiting scroll 13, and the high pressure portion that is an inner region of the sliding partition ring 78 is formed by the sliding partition ring 78 while performing the orbiting motion. And a back pressure portion set at an intermediate pressure between the high pressure and the low pressure, which is the outer region. By applying pressure on the back surface, the orbiting scroll 13 is stably pressed against the fixed scroll 12, reducing leakage and performing stable circular orbit movement.

  Here, as shown in FIG. 2, the sliding partition ring 78 acts on the thrust direction force from the compression chamber 15 acting on the orbiting scroll 13 (force that causes the orbiting scroll 12 to be pulled away from the fixed scroll 13). The center point is shifted from the center point Ob of the main bearing member so that the center point and the center point Oa of the sliding partition ring 78 are substantially the same.

  With the above configuration, the spiral wrap 12b of the fixed scroll 12 has an asymmetric wrap shape that is expanded to near the end of the spiral wrap 13b of the orbiting scroll 13, and thus is formed on the outer wall side of the wrap portion 13b of the orbiting scroll 13. In the suction process of confining the working fluid in the compression chamber 15, the pressure loss and the heat receiving loss can be reduced, and the efficiency can be improved. Further, the center point of the main bearing member 11 is such that the center point of action of the force of the orbiting scroll 13 acting on the orbiting scroll 13 and the center point of the sliding partition ring 78 is substantially the same. Since the main bearing member 11 is shifted further, the rollover moment can be reduced. As a result, the operation can be performed without overturning even at a low compression ratio without increasing the back pressure. Moreover, even if carbon dioxide refrigerant, which is a high-pressure refrigerant, is used, the back pressure can be set small, so that no excessive surface pressure is generated on the thrust surface, and high reliability of the thrust surface can be ensured.

(Embodiment 2)
FIG. 3 shows an example of a longitudinal sectional view of a vertical scroll compressor according to the second embodiment of the present invention, and FIG. 4 shows a front view of the orbiting scroll of the scroll compressor according to the second embodiment of the present invention.

  As shown in FIG. 3, a sliding partition ring 78 disposed on the orbiting scroll 13 is provided on the back surface portion of the orbiting scroll 13, and the sliding partition ring 78 is moved by the sliding partition ring 78 while performing the orbiting motion. It is partitioned into a high pressure portion that is an inner region and a back pressure portion that is set to an intermediate pressure between a high pressure and a low pressure that is an outer region. By applying pressure on the back surface, the orbiting scroll 13 is stably pressed against the fixed scroll 12, reducing leakage and performing stable circular orbit movement.

  Here, as shown in FIG. 4, the sliding partition ring 78 acts as a thrust force from the compression chamber 15 acting on the orbiting scroll 13 (force that causes the orbiting scroll 12 to be pulled away from the fixed scroll 13). The center point and the center point Oa of the sliding partition ring 78 are shifted from the center point Oc of the orbiting scroll so as to be substantially the same, and are installed on the back surface of the orbiting scroll 13.

  With the above configuration, the spiral wrap 12b of the fixed scroll 12 has an asymmetric wrap shape that is expanded to near the end of the spiral wrap 13b of the orbiting scroll 13, and thus is formed on the outer wall side of the wrap portion 13b of the orbiting scroll 13. In the suction process of confining the working fluid in the compression chamber 15, pressure loss and heat receiving loss can be reduced, and high efficiency can be achieved. In addition, since the sliding partition ring 78 is installed on the back surface portion of the orbiting scroll 13, even if the orbiting scroll 13 performs the orbiting motion, the pressure applied to the back surface portion of the orbiting scroll 13 can always be constant, and The orbiting scroll 13 acting on the orbiting scroll 13 is shifted from the center point of the orbiting scroll 13 so that the acting center point of the force to be separated from the fixed scroll 12 and the center point of the sliding partition ring 78 are substantially the same. Since it is installed on the back side of the orbiting scroll 13, the rollover moment generated by the orbiting of the orbiting school 13 can be reduced more effectively. As a result, the back pressure is not increased so much, and even at a low compression ratio. You can drive without overturning. Even if carbon dioxide refrigerant, which is a high-pressure refrigerant, is used, the back pressure can be set small, so that no excessive surface pressure is generated on the thrust surface, and high reliability of the thrust surface can be ensured.

  In addition, as shown in FIG. 3, the orbiting scroll 13 can be turned by providing a passage 79 for supplying the lubricating oil supplied to the high-pressure portion on the back surface of the orbiting scroll 13 to the back pressure space. The opening at one end of the passage provided inside the main bearing member 11 by the movement reciprocates between the high pressure portion and the back pressure space side across the sliding partition ring 78. With this configuration, the high pressure portion and the back pressure space are intermittently communicated, and it is possible to supply an appropriate amount of lubricating oil to the compression chamber 15, suppressing performance deterioration due to suction heating, and realizing high efficiency. . Needless to say, if the passage 79 is provided with a throttle, an appropriate amount of lubricating oil can be supplied to the compressor chamber 15 and the efficiency can be improved.

  In the main bearing member 11, since at least the sliding surface with the sliding partition ring 78 is made of an aluminum-based material, the slidability with the sliding partition ring 78 is improved. The sealing performance with the main bearing member 11 is improved, and high efficiency and high reliability can be obtained.

  As described above, the scroll compressor according to the present invention makes it possible to realize high efficiency and high reliability without reducing the heat receiving loss and pressure loss in the suction process, and without overturning even at a low compression ratio. The working fluid is not limited to a refrigerant, and can be applied to scroll fluid machines such as an air scroll compressor, a vacuum pump, an oil-free compressor, and a scroll type expander.

Sectional drawing of the scroll compressor in Embodiment 1 of this invention The front view of the main bearing member of the scroll compressor in Embodiment 1 of this invention Sectional drawing of the scroll compressor in Embodiment 2 of this invention The front view of the turning scroll of the scroll compressor in Embodiment 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 4a Main shaft part 6 Oil 7 Oil supply mechanism 11 Main bearing member 12 Fixed scroll 12a End plate 12b Wrap 12c Groove 13 Turning scroll 13a End plate 13b Wrap 14 Self-rotating mechanism 15 Compression chamber 16 Suction pipe 17 Suction port 18 Discharge port 19 Reed valve 29 Back pressure chamber 78 Sliding partition ring 79 Passage Oa Center point of sliding partition ring Ob Center point of main bearing member Oct Center point of orbiting scroll

Claims (4)

When the fixed scroll part and the orbiting scroll part where the spiral wrap rises from the end plate are meshed to form a compression chamber between them, and the orbiting scroll part is turned along a circular path under the rotation restraint by the rotation restraint mechanism The compression chamber moves while changing its volume to perform suction, compression, and discharge, and a high pressure that applies high pressure to the main bearing member that backs up the end plate back side of the orbiting scroll and the central part on the back side of the end plate by lubricating oil And a high-pressure part are partitioned by a ring-shaped sliding partition ring having a orbiting scroll and an abutment part, and a lower pressure is applied to the outer peripheral part of the rear face of the orbiting scroll end plate than the high-pressure part. In a scroll compressor having a pressure space, carbon dioxide is used as a refrigerant, and the winding end of the outer wall curve of the spiral wrap of the orbiting scroll The inner wall curve of the spiral wrap of the fixed scroll that extends to the extent that it forms the inner wall of the spiral wrap of the fixed scroll and is substantially the same as the center of action of the thrust force from the compression chamber acting on the orbiting scroll A scroll compressor characterized in that the center point of the sliding partition ring is located at the same position and is installed on the main bearing member. When the fixed scroll part and the orbiting scroll part where the spiral wrap rises from the end plate are meshed to form a compression chamber between them, and the orbiting scroll part is turned along a circular path under the rotation restraint by the rotation restraint mechanism The compression chamber moves while changing its volume to perform suction, compression, and discharge, and a high pressure that applies high pressure to the main bearing member that backs up the end plate back side of the orbiting scroll and the central part on the back side of the end plate by lubricating oil And a high-pressure part are partitioned by a ring-shaped sliding partition ring having a orbiting scroll and an abutment part, and a lower pressure is applied to the outer peripheral part of the rear face of the orbiting scroll end plate than the high-pressure part. In a scroll compressor having a pressure space, carbon dioxide is used as a refrigerant, and the winding end of the outer wall curve of the spiral wrap of the orbiting scroll The inner wall curve of the spiral wrap of the fixed scroll that has been extended to form the inner wall of the spiral wrap of the fixed scroll and is substantially the same as the central point of action of the thrust force from the compression chamber acting on the orbiting scroll. A scroll compressor characterized in that the center point of the sliding partition ring is located at the same position and is installed on the rear surface of the end plate of the orbiting scroll. A passage for supplying lubricating oil supplied to the high pressure portion to the back pressure space is provided inside the main bearing member, and an opening at one end of the passage straddles the seal member by the orbiting motion of the orbiting scroll part. The scroll compressor according to claim 2, wherein the high-pressure portion and the back pressure space are intermittently communicated by reciprocating the pressure space side. 4. The scroll compressor according to claim 2, wherein at least a sliding surface of the main bearing member with the sliding partition ring is made of an aluminum material.

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